The Glasdrumman ambush was an attack by the South Armagh Brigade of the Provisional Irish Republican Army (IRA) against a British Army observation post in Glasdrumman, County Armagh on 17 July 1981. An attempted ambush by the British Army on IRA members at a scrapyard southwest of Crossmaglen was itself ambushed, resulting in the death of one British soldier and the IRA retaining the ability to set up checkpoints in South Armagh.